code: def init(self, state):
      self.t = 0
      state["z"] = pyro.sample(
          "z_init", dist.Delta(torch.tensor([1.0, 0.0]), event_dim=1)
      )
  
imports: import pytest
  import torch
  import pyro
  import pyro.distributions
  import pyro.poutine
  from pyro.infer import SMCFilter
  from pyro.infer.smcfilter import _systematic_sample
  from tests.common import assert_close
label_desc: Use image node_id 2 for calling the HarmonicModel obj's underlying member method code with example usage: obj.init(state) without return types